NXP Semiconductors MPC5644A Reference Manual page 476

System Integration Unit (SIU)
Signal
Primary ETPU_A[23]
ALT1 IRQ[11]
ALT2 ETPU_A[21]
ALT3 FR_A_TX_EN
GPIO GPIO[137]
1
In cases where an I/O function can be either an input or an output, I/O direction is specified using the IBE and OBE
bits. Set IBE = 1 for input or OBE = 1 for output.
2
For I/O functions that change direction dynamically, such as the external data bus, switching between input and
output is handled internally and the IBE and OBE bits are ignored.
16.6.15.91 Pad Configuration Register 138 (SIU_PCR138)
SIU_BASE+0x154
0 1
R
0 0
W
Reset
0 0
= Unimplemented or Reserved
1
When configured as IRQ, the OBE bit has no effect. The OBE bit must be set to one for both ETPU_A[24] and
GPIO[138] when configured as outputs.
2
When configured as DSPI_C_SCK_LVDS, IRQ or GPO, the IBE bit may be set to one to reflect the pin state in
the corresponding GPDI register. Setting the IBE bit to zero reduces power consumption. The IBE bit must be set
to one for both ETPU_A[24] and GPIO[138] when configured as inputs.
3
The weak pull up/down selection at reset for the ETPU_A[24] pin is determined by the WKPCFG pin.
Signal
Primary ETPU_A[24]
ALT1 IRQ[12]
ALT2 DSPI_C_SCK_LVDS DSPI
GPIO GPIO[138]
1
In cases where an I/O function can be either an input or an output, I/O direction is specified using the IBE and OBE
bits. Set IBE = 1 for input or OBE = 1 for output.
2
For I/O functions that change direction dynamically, such as the external data bus, switching between input and
output is handled internally and the IBE and OBE bits are ignored.
3
The eTPU function controlled by this register has an additional dependency on the SIU_ISEL8 register settings.
Please see Section 16.6.22, IMUX Select Register 8
476
Table 16-126. SIU_PCR137 PA values
Name Module
eTPU
SIU
eTPU
FlexRay
SIU
2 3 4 5 6
0 PA OBE
0 0 0 0 0
Figure 16-124. Pad Configuration Register (SIU_PCR138)
Table 16-127. SIU_PCR138 PA values
Name Module
3
eTPU
SIU
SIU
MPC5644A Microcontroller Reference Manual, Rev. 6
Description
eTPU channel I/O
External interrupt I
eTPU channel O
FlexRay transmit enable O
GPIO I/O
7 8 9 10
1 2
IBE 0 0 ODE
0 0 0 0
Description
eTPU channel I/O
External interrupt I
LVDS clock O
GPIO I/O
(SIU_ISEL8), for more detail.
1,2
I/O PA value
0b0001
0b0010
0b0100
0b1000
0b0000
11 12 13 14 15
HYS SRC WPE WPS
0 0 0 1 WKP
1,2
I/O PA value
0b001
0b010
0b100
0b000
Freescale Semiconductor
3